Wondering what can be done to make a fake fondant cake last longer??
...I should add. It is one that will be on display.
The only thing you need to do is keep it out of the sun (because it will fade), and don't get it wet. I redo my display cakes every few years, just to keep the styles updated. If they get dusty, just use a soft paintbrush on them. They'll be fine. (I take mine to a lot of event and they hold up perfectly)